What is too high or low?

Polyhydramnios

(pol-e-hy-DRAM-nee-os), also called hydramnios, amniotic fluid index of is defined greater than 25 centimetres as an quadrant of the uterus when the deepest pools are added together, or in each when the deepest pool fluid is measured as greater than 8cm. of amniotic Oligohydramnios

(oli-go-hy-DRAM-nee-os) is defined as an amniotic that is less than expected fluid for gestational age – index than 5cm. usually this means a volume of less